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static_compiler.rb
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static_compiler.rb
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require 'fileutils'
module Sprockets
module Rails
class StaticCompiler
attr_accessor :env, :target, :paths
def initialize(env, target, paths, options = {})
@env = env
@target = target
@paths = paths
@digest = options.fetch(:digest, true)
@manifest = options.fetch(:manifest, true)
@zip_files = options.delete(:zip_files) || /\.(?:css|html|js|svg|txt|xml)$/
@current_source_digests = options.fetch(:source_digests, {})
@current_digest_files = options.fetch(:digest_files, {})
@digest_files = {}
@source_digests = {}
end
def compile
start_time = Time.now.to_f
env.each_logical_path(paths) do |logical_path|
# Fetch asset without any processing or compression,
# to calculate a digest of the concatenated source files
unprocessed_asset = env.find_asset(logical_path, :process => false)
@source_digests[logical_path] = unprocessed_asset.digest
# Recompile if digest has changed or compiled digest file is missing
current_digest_file = @current_digest_files[logical_path]
if @source_digests[logical_path] != @current_source_digests[logical_path] ||
!(current_digest_file && File.exists?("#{@target}/#{current_digest_file}"))
if asset = env.find_asset(logical_path)
@digest_files[logical_path] = write_asset(asset)
end
else
@digest_files[logical_path] = @current_digest_files[logical_path]
env.logger.debug "Not compiling #{logical_path}, sources digest has not changed " <<
"(#{@source_digests[logical_path][0...7]})"
end
end
# Encode all filenames & digests as UTF-8. YAML dumps other string encodings as !binary.
@source_digests = encode_hash_as_utf8 @source_digests
@digest_files = encode_hash_as_utf8 @digest_files
if @manifest
write_manifest(source_digests: @source_digests, digest_files: @digest_files)
end
# Update digests in Rails config. (Important for when :nondigest is run after :primary)
config = ::Rails.application.config
config.assets.digest_files = @digest_files
config.assets.source_digests = @source_digests
elapsed_time = ((Time.now.to_f - start_time) * 1000).to_i
env.logger.debug "Processed #{'non-' unless @digest}digest assets in #{elapsed_time}ms"
end
def write_manifest(manifest)
FileUtils.mkdir_p(@target)
File.open("#{@target}/manifest.yml", 'wb') do |f|
YAML.dump(manifest, f)
end
end
def write_asset(asset)
path_for(asset).tap do |path|
filename = File.join(target, path)
FileUtils.mkdir_p File.dirname(filename)
asset.write_to(filename)
asset.write_to("#{filename}.gz") if filename.to_s =~ @zip_files
end
end
def path_for(asset)
@digest ? asset.digest_path : asset.logical_path
end
private
def encode_hash_as_utf8(hash)
hash.inject({}) {|h, (k, v)| h[k.encode("UTF-8")] = v.encode("UTF-8"); h }
end
end
end
end